/*
 * Copyright 2004 - 2013 Wayne Grant
 *           2013 - 2024 Kai Kramer
 *
 * This file is part of KeyStore Explorer.
 *
 * KeyStore Explorer is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * KeyStore Explorer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with KeyStore Explorer.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.kse.gui.dialogs;

import java.awt.BorderLayout;
import java.awt.Dialog;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ResourceBundle;

import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EmptyBorder;
import javax.swing.border.EtchedBorder;

import org.kse.gui.components.JEscDialog;
import org.kse.gui.PlatformUtil;

/**
 * Dialog used for entering a KeyStore alias.
 */
public class DGetAlias extends JEscDialog {
    private static final long serialVersionUID = 1L;

    private static ResourceBundle res = ResourceBundle.getBundle("org/kse/gui/dialogs/resources");

    private static final String CANCEL_KEY = "CANCEL_KEY";

    private JPanel jpAlias;
    private JLabel jlAlias;
    private JTextField jtfAlias;
    private JPanel jpButtons;
    private JButton jbOK;
    private JButton jbCancel;

    private String alias;

    /**
     * Creates a new DGetAlias dialog.
     *
     * @param parent The parent frame
     * @param title  The dialog's title
     * @param alias  The alias to display initially
     */
    public DGetAlias(JFrame parent, String title, String alias) {
        super(parent, title, Dialog.ModalityType.DOCUMENT_MODAL);
        initComponents(alias);
    }

    /**
     * Creates new DGetAlias dialog where the parent is a dialog.
     *
     * @param parent   The parent dialog
     * @param title    The dialog's title
     * @param modality Is the dialog modal?
     * @param alias    The alias to display initially
     */
    public DGetAlias(JDialog parent, String title, Dialog.ModalityType modality, String alias) {
        super(parent, title, modality);
        initComponents(alias);
    }

    /**
     * Get the alias entered by the user.
     *
     * @return The alias, or null if none was entered
     */
    public String getAlias() {
        return alias;
    }

    private void initComponents(final String alias) {
        getContentPane().setLayout(new BorderLayout());

        jlAlias = new JLabel(res.getString("DGetAlias.jlAlias.text"));
        jtfAlias = new JTextField(15);

        if (alias != null) {
            jtfAlias.setText(alias);
            jtfAlias.setCaretPosition(0);
        }

        jbOK = new JButton(res.getString("DGetAlias.jbOK.text"));
        jbOK.addActionListener(evt -> okPressed());

        jbCancel = new JButton(res.getString("DGetAlias.jbCancel.text"));
        jbCancel.addActionListener(evt -> cancelPressed());
        jbCancel.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW)
                .put(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), CANCEL_KEY);
        jbCancel.getActionMap().put(CANCEL_KEY, new AbstractAction() {
            private static final long serialVersionUID = 1L;

            @Override
            public void actionPerformed(ActionEvent evt) {
                cancelPressed();
            }
        });

        jpAlias = new JPanel(new FlowLayout(FlowLayout.CENTER));
        jpAlias.add(jlAlias);
        jpAlias.add(jtfAlias);
        jpAlias.setBorder(new CompoundBorder(new EmptyBorder(5, 5, 5, 5),
                                             new CompoundBorder(new EtchedBorder(), new EmptyBorder(5, 5, 5, 5))));

        jpButtons = PlatformUtil.createDialogButtonPanel(jbOK, jbCancel);

        getContentPane().add(jpAlias, BorderLayout.CENTER);
        getContentPane().add(jpButtons, BorderLayout.SOUTH);

        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent evt) {
                closeDialog();
            }
        });

        setResizable(false);

        getRootPane().setDefaultButton(jbOK);

        pack();

        SwingUtilities.invokeLater(() -> {
            jtfAlias.requestFocus();
            if (alias != null) {
                jtfAlias.setSelectionStart(0);
                jtfAlias.setSelectionEnd(alias.length());
            }
        });
    }

    private boolean checkAlias() {
        String alias = jtfAlias.getText().trim().toLowerCase();

        if (!alias.isEmpty()) {
            this.alias = alias;
            return true;
        }

        JOptionPane.showMessageDialog(this, res.getString("DGetAlias.AliasReq.message"), getTitle(),
                                      JOptionPane.WARNING_MESSAGE);
        return false;
    }

    private void okPressed() {
        if (checkAlias()) {
            closeDialog();
        }
    }

    private void cancelPressed() {
        closeDialog();
    }

    private void closeDialog() {
        setVisible(false);
        dispose();
    }
}
